Milling is a great way to create a thread. Recall from last month's column that we discussed advantages of thread milling. Some people might be concerned with programming issues when thread milling. Well, let's look at a sample. The following program is designed to thread mill a 2.625 × 14 TPI internal thread using a 1" diameter multiple flute cutter with 3/4" flute length. The plan is to position the cutter to the lowest point of the thread and feed out of the part. Our program calls for the tool to use a 45° ramp-in move, complete a 360° rotation within the part and then finish with a 45° ramp-out move.
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